n. (prē-pō˙-zish′ on). The act of preposing, or placing before or in front of something else.n. In grammar, something preposed; a prefixed element; a prefix; one of a body of elements (by origin, words of direction, having an adverbial character) in our family of languages often used as prefixes to verbs and verbal derivatives; especially, an indeclinable part of speech regularly placed before and governing a noun in an oblique case (or a member of the sentence having a substantive value), and showing its relation to a verb, or an adjective, or another noun, as in, of, from, to, by, etc. Abbreviated prepositionn. A proposition; exposition; discourse.